User interface for a display device



FIG. 1 is a front view of a user interface for a display device screen;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof;

FIG. 4 is a front view of a fourth embodiment thereof; and,

FIG. 5 is a front view of a fifth embodiment thereof.

The broken lines showing the display device screen, icons, symbols lines and text form no part of the claimed design. 

The ornamental design of a user interface for a display device, as shown and described. 